abo exam accurate Questions & Solutions(SCORED A+)

vitreous humor - ANSWER the transparent, colorless mass of soft, gelatinous material which fills the eyeball behind the lens: 1.42 - ANSWER the index of refraction of the crystalline lens is: 1.37 - ANSWER the cornea has an index of refraction of: 6 - ANSWER the extra-ocular muscles are inserted into the sclera and serve to rotate the eye in all possible directions. There are _______________ of these muscles in each eye. sclera and cornea - ANSWER the fibrous tunic is comprised of the: in the brain - ANSWER fusion occurs: the ciliary body - ANSWER the aqueous fluid is continually being manufactured by: accommodation - ANSWER the ability of the eye to bring objects if varying distances to focus on the retina is known as: myopia - ANSWER when accommodation is at rest, rays of light from a distant source come to focus in front of the retina. this condition is known as: hyperopia - ANSWER when accommodation is at rest, rays of light from a distant source come to focus behind the retina. this condition is known as: optic nerve - ANSWER impulses are carried from the retina to the brain along the: the pupils constrict, the eyes converge, & the crystalline lens accommodates - ANSWER while reading, or performing other near vision tasks: forvea centralis - ANSWER that area of the retina capable if perceiving the greatest amount of details is: 43 diopters - ANSWER the average cornea has a refractive power of approximately: the epithelium - ANSWER that layer if the cornea which is highly regenerative is: rods - ANSWER Night vision is chiefly a function of the: esophoria - ANSWER A tendency of the visual axis to deviate inward when the eyes are in a position of the rest is known as: hyperopic - ANSWER A "farsighted" eye is one that is: diplopia - ANSWER The term used to indicate "double vision" is: presbyopia - ANSWER The condition in which the ability to accommodate for near vision ecomes inadequate because of loss of elasticity of the crystalline lens is called: amblyopia - ANSWER When there is loss of vision without any apparent disease of the eye, it is known as: astigmatism - ANSWER A refractive error in which the rays of light do not come to a single point of focus is called: cataract - ANSWER The condition in which the crystalline lens of the eye gradually loses its transparency with consequent loss of visual acuity is known as: glaucoma - ANSWER An ocular disease as its primary characteristic a sustained increase in intraocular pressure. posterior chamber - ANSWER The space between the back of the iris and the front of the lens which is filled with aqueous is the: hyperphoria - ANSWER A tendency of one eye to deviate upward is: cones - ANSWER The photosensitive receptors of the retina which are responsible for sharp visual acuity and color perception are the: the stroma - ANSWER The layer of the cornea which comprises ninety percent of its thickness is: anisometropia - ANSWER A condition in which the refractive error of one eye significantly differs from that of the other and where both eyes have the same sign (i.e. both eyes are myopic or myperopic) is known as: compound hyperopic astigmatism - ANSWER The refractive error which results in two points of focus falling behind the retina is: irregular astigmatism - ANSWER The refractive condition caused by a damaged cornea so that rays of light come to many focal points on the retina is known as: IN - ANSWER When the optical centers of a pair of plus lenses are positioned narrower than the PD, it produces prism base... OUT - ANSWER When the optical centers of a pair of minus lenses are positioned narrower than the PD, it produces prism base... DOWN - ANSWER When a patient looks through a plus lens above the optical center, it produces prism base... DOWN - ANSWER When a patient looks through a minus lens below the optical center, it produces prism base... 1.0 - ANSWER How much prism is induced 5 mm away from the optical center of a +2.00 diopter lens? 0.25 - ANSWER How much prism is induced 10 mm away from the optical center of a -0.25 diopter lens? 3.2 - ANSWER How much prism is induced 2 mm away from the optical center of a +16.00 diopter lens? 0.9 BASE OUT - ANSWER came in with the optical centers positioned 61 mm apart. The work order indicates the patient's PD measures 64 mm and the prescription calls fro a -3.00 spheres in each eye. How much total prism is induced and in which direction is the base? 1.45 BASE OUT - ANSWER A patient's prescription calls for OD: +4.75 OS: +2.50. The optical centers of the finished spectacles are found to be positioned 4 mm too wide. How much total prism is induced and in which direction is the base? air - ANSWER the index of refraction is lowest in: toward the base - ANSWER when parallel rays of light enter prism, the light is deviated: 39.37 - ANSWER one meter is equal to _______ inches. 200 - ANSWER two meters equal ______ centimeters. dividing the speed of light in air by the speed of light in the material. - ANSWER the index of refraction of any given transparent material can be determined by: 186,000 miles per second - ANSWER the speed of light in air is approximately: refraction - ANSWER when the direction of light is deviated in the course of the passing from one transparent medium to another it is known: 1.70 - ANSWER light travels through a certain transparent medium at the rate of approximately 109,412 miles per sec. the index of refraction of that medium is: 1 prism diopter - ANSWER if a prism can displace an image one centimeter at a distance of one meter, it is said to have a power of: wavelength - ANSWER the distance between the crest of two waves is called the: -20 cm - ANSWER the focal length of a -5.00 diopter lens is: base up prism - ANSWER decentering a plus lens upward will result in: corpuscular - ANSWER the _________________ theory describes light as traveling through space in minute bursts of energy. +0.50 diopters - ANSWER if a converging lens has a focal length of +2 meters, its power is: 390 and 750 nanometers - ANSWER visible light is part of the overall spectrum of radiant energy. although the range of wavelengths of which are perceived as visible light can vary with the individual, it is generally understood to lie between: power of the lens X the decentration in mm / 10 - ANSWER prentice's rule states that the amount of induced prism is equal to: 0.6 prism diopters base in - ANSWER a pair of spectacles were ordered with a prescription of -2.00D in each eye and a PD of 63 mm. they were received from the lab with the optical centers set 66mm apart. how much total prism was induced and in which direction is the base? 0.8 prism diopters base out - ANSWER a pair of +4.00 spectacle lenses were ordered from the laboratory with a PD of 59 mm. when these lenses were verified, it was determined that the optical centers were positioned 4mm too wide. how much prism was induced in each eye and in which direction is the base? virtual - ANSWER a diverging lens produces a _______ image. +100 cm - ANSWER the focal length of a +1.00 diopter lens is: diverging - ANSWER rays emanating from a point source of light are said to be: push the front out more - ANSWER if the pad arms are lengthened, this adjustment will: half round - ANSWER the plier best used for adjustment of rocking pads is: 13mm - ANSWER the standard distance between the segments in fused double segment multifocals in most cases is: a center piece with lens bars connecting the endpieces and temples - ANSWER a semi-rimless mounting consists of: 1.70 - ANSWER hilite lenses have a refractive index of: measure lens base curve - ANSWER most commonly, opticians use a Geneva lens measure to: CR-39 - ANSWER plastic lenses are made of a hard resin material known as: plus power - ANSWER a hyperope always has in his prescription the following kind of power: decrease pantoscopic tilt - ANSWER of the eyewires touch the cheeks, the adjustment to take care if this condition would be: intermediate - ANSWER if the pupillary distance is measured while the patient is focusing on a point 30 inches in front of his eyes, the PD measured is known as the _______PD phoria - ANSWER tendency of an eye to deviate from its normal position is called: meniscus lens - ANSWER a lens having one concave and one convex surface is called a: the myope - ANSWER the type of patient often bothered by specular images is: upper lid - ANSWER a ptosis crutch is used to give support to_____________ far point of the eye - ANSWER an ophthalmic correction from an ametrope is to focus parallel incident light rays at the: cataract lenses - ANSWER aspheric lens surfaces are most commonly used with: spherical - ANSWER most aspheric surfaces are: electrician - ANSWER which of the following occupations would be best suited with double segment lens most minus power - ANSWER a slab off should be ground in the lens which was the: aviator shape, frame PD larger than patient PD - ANSWER when selecting a frame for a potential progressive power lens candidate, avoid the following: +100 + 0.50 x 180 - ANSWER a pair of crossed cylinders, +100 x 90 and +150 x 180 would produce a power of:1.42 - ANSWER the index of refraction of the crystalline lens is: 1.42 - ANSWER the index of refraction of the crystalline lens is: